Java IntStream skip() Method

The skip() method in Java, part of the java.util.stream.IntStream interface, is used to return a stream consisting of the remaining elements of the original stream after discarding the first n elements. This method is useful when you need to ignore a certain number of elements in a stream and process the remaining ones.

Table of Contents

1. Introduction
2. skip() Method Syntax
3. Understanding skip()
4. Examples
   • Basic Usage
   • Using skip() with Other Stream Operations
5. Real-World Use Case
6. Conclusion

Introduction

The skip() method returns a stream consisting of the remaining elements of the original stream after discarding the first n elements. This method is particularly useful for scenarios such as pagination, where you need to process a subset of elements after skipping a certain number of elements.

skip() Method Syntax

The syntax for the skip() method is as follows:

IntStream skip(long n)

Parameters:

• n: The number of leading elements to skip.

Returns:

• An IntStream consisting of the remaining elements after skipping the first n elements.

Throws:

• This method does not throw any exceptions.

Understanding skip()

The skip() method allows you to skip a specified number of elements from the beginning of the stream. If the stream contains fewer elements than the specified number, an empty stream is returned.

Examples

Basic Usage

To demonstrate the basic usage of skip(), we will create an IntStream and use skip() to ignore the first three elements.

Example

import java.util.stream.IntStream;

public class SkipExample {
    public static void main(String[] args) {
        IntStream intStream = IntStream.of(1, 2, 3, 4, 5, 6, 7);

        // Use skip() to ignore the first 3 elements
        IntStream skippedStream = intStream.skip(3);

        // Print the remaining elements
        skippedStream.forEach(System.out::println);
    }
}

Output:

4
5
6
7

Using skip() with Other Stream Operations

This example shows how to use skip() in combination with other stream operations, such as filtering and mapping.

Example

import java.util.stream.IntStream;

public class SkipWithOtherOperationsExample {
    public static void main(String[] args) {
        IntStream intStream = IntStream.range(1, 11);

        // Skip the first 5 elements, filter even numbers, and map to their squares
        IntStream processedStream = intStream.skip(5)
                                             .filter(n -> n % 2 == 0)
                                             .map(n -> n * n);

        // Print the processed elements
        processedStream.forEach(System.out::println);
    }
}

Output:

36
64
100

Real-World Use Case

Implementing Pagination

In real-world applications, the skip() method can be used to implement pagination by skipping a certain number of elements and then limiting the number of elements to process.

Example

import java.util.stream.IntStream;

public class PaginationExample {
    public static void main(String[] args) {
        IntStream data = IntStream.range(1, 101); // Simulate data from 1 to 100

        int page = 2;
        int pageSize = 10;

        // Skip the elements of previous pages and limit to the page size
        IntStream pageData = data.skip((page - 1) * pageSize)
                                 .limit(pageSize);

        // Print the elements of the current page
        pageData.forEach(System.out::println);
    }
}

Output:

11
12
13
14
15
16
17
18
19
20

Conclusion

The IntStream.skip() method is used to return a stream consisting of the remaining elements of the original stream after discarding the first n elements. This method is particularly useful for scenarios such as pagination and processing subsets of elements. By understanding and using this method, you can efficiently manage and process streams of integer values in your Java applications, handling cases where you need to skip a certain number of elements.